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main.go
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main.go
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package main
import (
"bytes"
"crypto/tls"
"flag"
"fmt"
"io"
"io/ioutil"
"net"
"net/http"
"net/http/httptest"
"net/url"
"os"
"reflect"
"sort"
"strconv"
"strings"
"time"
"github.com/aws/aws-sdk-go-v2/aws"
"github.com/aws/aws-sdk-go-v2/aws/defaults"
"github.com/aws/aws-sdk-go-v2/aws/endpoints"
"github.com/aws/aws-sdk-go-v2/aws/external"
)
func main() {
var filterService, filterOp string
flag.StringVar(&filterService, "s", "", "The `service` to execute. If unset will run all services.")
flag.StringVar(&filterOp, "o", "", "The `operation` to execute. If unset will run all operations. Requires service set.")
flag.Parse()
if len(filterOp) > 0 && len(filterService) == 0 {
flag.PrintDefaults()
panic("operation filter requires service set also")
}
w := writer{
buf: bytes.NewBuffer(nil),
indentStr: "\t",
}
server := setupServer(w.Indent())
defer server.Close()
cfg, err := external.LoadDefaultAWSConfig()
if err != nil {
panic("failed to load config " + err.Error())
}
cfg.EndpointResolver = aws.ResolveWithEndpointURL(server.URL)
cfg.Region = endpoints.UsWest2RegionID
cfg.Credentials = aws.AnonymousCredentials
cfg.Handlers.Validate.Remove(defaults.ValidateParametersHandler)
cfg.HTTPClient = &http.Client{
Transport: &http.Transport{
TLSClientConfig: &tls.Config{
InsecureSkipVerify: true,
},
DialContext: (&net.Dialer{
Timeout: 30 * time.Second,
KeepAlive: 30 * time.Second,
DualStack: true,
}).DialContext,
MaxIdleConns: 100,
IdleConnTimeout: 90 * time.Second,
TLSHandshakeTimeout: 10 * time.Second,
ExpectContinueTimeout: 1 * time.Second,
},
}
cfg.Handlers.Send.PushFront(func(r *aws.Request) {
w.Writef("%s.%s:", r.Metadata.ServiceName, r.Operation.Name)
})
for _, service := range createServices(cfg) {
if len(filterService) > 0 && service.name != filterService {
continue
}
fmt.Println("Processing:", service.name)
if err := callService(service.value, filterOp); err != nil {
panic(fmt.Sprintf("Service, %s failed, %v", service.name, err))
}
}
io.Copy(os.Stdout, w.buf)
}
const (
allowedRecursion = 2
sliceSize = 3
)
func callService(svcV reflect.Value, filterOp string) error {
reqOption := aws.Option(
func(r *aws.Request) {
r.Handlers.Build.PushBack(func(req *aws.Request) {
endpoint, _ := r.Config.EndpointResolver.ResolveEndpoint(r.Metadata.ServiceName, r.Config.Region)
origURL, _ := url.Parse(endpoint.URL)
// Correct ContentLength fields for S3 operations
switch r.Metadata.ServiceName {
case "s3":
switch r.Operation.Name {
case "PutObject", "UploadPart":
n, _ := computeBodyLength(r.GetBody())
r.HTTPRequest.Header.Set("Content-Length", strconv.FormatInt(n, 10))
}
case "machinelearning":
newURL := r.HTTPRequest.URL
r.HTTPRequest.URL = origURL
r.HTTPRequest.URL.Path = newURL.Path
if !strings.HasPrefix(r.HTTPRequest.URL.Path, "/") {
r.HTTPRequest.URL.Path = "/" + r.HTTPRequest.URL.Path
}
r.HTTPRequest.URL.RawPath = newURL.RawPath
r.HTTPRequest.URL.RawQuery = newURL.RawQuery
}
})
r.Handlers.Complete.PushBack(func(req *aws.Request) {
if r.Error != nil {
fmt.Println(r.Params)
}
})
},
)
svcT := svcV.Type()
n := svcT.NumMethod()
ops := []string{}
for i := 0; i < n; i++ {
fm := svcT.Method(i)
fName := fm.Name
if fName == "NewRequest" || !strings.HasSuffix(fName, "Request") || (len(filterOp) > 0 && fName != filterOp) {
continue
}
ops = append(ops, strings.TrimSuffix(fName, "Request"))
}
sort.Strings(ops)
for _, op := range ops {
fName := op + "Request"
fv := svcV.MethodByName(fName)
fm, _ := svcT.MethodByName(fName)
ft := fm.Type
fmt.Println("-", op)
it := ft.In(1)
iv := valueForType(it, visitType(it))
ovs := fv.Call([]reflect.Value{iv})
m := findMethod(ovs[0], "ApplyOptions")
m.Call([]reflect.Value{reflect.ValueOf(reqOption)})
m = findMethod(ovs[0], "Send")
ovs = m.Call([]reflect.Value{})
if v := ovs[1]; !v.IsNil() {
return v.Interface().(error)
}
}
return nil
}
// findMethod finds the method name on the v type using a case-insensitive
// lookup. Returns nil if no method is found.
func findMethod(v reflect.Value, methodName string) *reflect.Value {
if v.Kind() != reflect.Struct {
return nil
}
t := v.Type()
for i := 0; i < t.NumMethod(); i++ {
if name := t.Method(i).Name; name == methodName {
m := v.MethodByName(name)
return &m
}
}
// Check if the method exists on a field
for i := 0; i < t.NumField(); i++ {
if m := findMethod(reflect.Indirect(v).Field(i), methodName); m != nil {
return m
}
}
return nil
}
func asVisited(v map[reflect.Type]int, t reflect.Type) (map[reflect.Type]int, bool) {
if c, ok := v[t]; ok {
if c == 0 {
return v, false
}
c--
v[t] = c
} else {
v[t] = allowedRecursion
}
return v, true
}
var ioReadSeekerType = reflect.TypeOf((*io.ReadSeeker)(nil)).Elem()
var emptyInterfaceType = reflect.TypeOf((*interface{})(nil)).Elem()
func valueForType(vt reflect.Type, visited *visitedType) reflect.Value {
var v reflect.Value
vtt := vt
if vtt.Kind() == reflect.Ptr {
vtt = vtt.Elem()
}
switch vtt.Kind() {
case reflect.Map:
v = reflect.MakeMap(vtt)
kt := vtt.Key()
kv := valueForType(kt, visited)
et := vtt.Elem()
ev := valueForType(et, visited)
v.SetMapIndex(kv, ev)
case reflect.Slice:
v = reflect.MakeSlice(vtt, sliceSize, sliceSize)
vet := vtt.Elem()
for i := 0; i < sliceSize; i++ {
sv := v.Index(i)
nsv := valueForType(vet, visited)
sv.Set(nsv)
}
case reflect.Interface:
switch vtt {
case ioReadSeekerType:
v = reflect.New(vtt)
v.Elem().Set(reflect.ValueOf(bytes.NewReader([]byte("byte value"))))
case emptyInterfaceType:
v = reflect.ValueOf("empty interface value")
default:
panic("value for interface, unknown type" + vtt.String())
}
case reflect.String:
v = reflect.New(vtt)
v.Elem().SetString("stringValue")
case reflect.Bool:
v = reflect.New(vtt)
v.Elem().SetBool(true)
case reflect.Uint8: // byte
v = reflect.New(vtt)
v.Elem().Set(reflect.ValueOf(uint8('b')))
case reflect.Int64:
v = reflect.New(vtt)
v.Elem().SetInt(987654321)
case reflect.Float64:
v = reflect.New(vtt)
v.Elem().SetFloat(123456789.321)
case reflect.Struct:
v = reflect.New(vtt)
ve := v.Elem()
n := ve.NumField()
for i := 0; i < n; i++ {
fv := ve.Field(i)
fs := vtt.Field(i)
ft := fv.Type()
if len(fs.PkgPath) != 0 {
continue
}
nested, keep := visited.Visit(ft)
if !keep {
continue
}
nfv := valueForType(ft, nested)
fv.Set(nfv)
}
default:
panic("unknown type, " + vtt.String())
}
if vt.Kind() != reflect.Ptr && v.Kind() == reflect.Ptr {
v = v.Elem()
}
return v
}
func setupServer(out writer) *httptest.Server {
server := httptest.NewTLSServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
out.Writef("Path:")
out.Indent().Writef(r.URL.Path)
out.Writef("Query:")
var keys []string
query := r.URL.Query()
for k := range query {
keys = append(keys, k)
}
sort.Strings(keys)
for _, k := range keys {
for _, v := range query[k] {
out.Indent().Writef("%s: %s", k, v)
}
}
out.Writef("Headers:")
keys = keys[0:0]
for k := range r.Header {
keys = append(keys, k)
}
sort.Strings(keys)
for _, k := range keys {
for _, v := range r.Header[k] {
out.Indent().Writef("%s: %s", k, v)
}
}
body, err := ioutil.ReadAll(r.Body)
if err != nil {
panic(err)
}
r.Body.Close()
out.Writef("Body:")
out.Indent().Writef(string(body))
}))
return server
}
type writer struct {
buf *bytes.Buffer
indent int
indentStr string
}
func (w writer) Writef(format string, args ...interface{}) error {
indent := strings.Repeat(w.indentStr, w.indent)
w.buf.WriteString(indent)
w.buf.WriteString(fmt.Sprintf(format, args...))
w.buf.WriteRune('\n')
return nil
}
func (w writer) Indent() writer {
newW := w
newW.indent++
return newW
}
type visitedType struct {
typ reflect.Type
left int
next *visitedType
}
func visitType(t reflect.Type) *visitedType {
return &visitedType{
typ: t,
left: allowedRecursion,
}
}
func (v *visitedType) String() string {
if v == nil {
return "END"
}
return fmt.Sprintf("Type:%v,Kind:%v,Left:%v->%v", v.typ.Name(), v.typ.Kind(), v.left, v.next.String())
}
func (v *visitedType) copy() *visitedType {
nv := &visitedType{}
oldNext := v
newNext := nv
for {
*newNext = *oldNext
oldNext = oldNext.next
if oldNext == nil {
break
}
newNext.next = &visitedType{}
newNext = newNext.next
}
return nv
}
func (v *visitedType) Visit(t reflect.Type) (*visitedType, bool) {
if v == nil {
return visitType(t), true
}
nv := v.copy()
last := nv
next := nv
for next != nil {
last = next
if next.typ != t {
next = next.next
continue
}
next.left--
return nv, next.left >= 0
}
last.next = visitType(t)
return nv, true
}
func computeBodyLength(r io.ReadSeeker) (int64, error) {
seekable := true
// Determine if the seeker is actually seekable. ReaderSeekerCloser
// hides the fact that a io.Readers might not actually be seekable.
switch v := r.(type) {
case aws.ReaderSeekerCloser:
seekable = v.IsSeeker()
case *aws.ReaderSeekerCloser:
seekable = v.IsSeeker()
}
if !seekable {
return -1, nil
}
curOffset, err := r.Seek(0, 1)
if err != nil {
return 0, err
}
endOffset, err := r.Seek(0, 2)
if err != nil {
return 0, err
}
_, err = r.Seek(curOffset, 0)
if err != nil {
return 0, err
}
return endOffset - curOffset, nil
}